With today's status quo, the roads are much cheaper than the amount of fuel or battery required, both financially and environmentally.

If we had a much cheaper and greener energy source maybe, but you can't run star wars speeders based on fossil fuels AND have an ozone layer the same time, and battery manufacturing also comes with an environmental price with the standards we know of.

While it would have benefits, the more you look, the more complicated flying vehicles get.